Modular SEPIC-Based Isolated dc–dc Converter with Reduced Voltage Stresses across the Semiconductors

Marcos Vinicius Mosconi Ewerling (), Telles Brunelli Lazzarin and Carlos Henrique Illa Font
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Marcos Vinicius Mosconi Ewerling: Department of Electrical and Electronic Engineering, Federal University of Santa Catarina, Florianopolis 88040-900, Brazil
Telles Brunelli Lazzarin: Department of Electrical and Electronic Engineering, Federal University of Santa Catarina, Florianopolis 88040-900, Brazil
Carlos Henrique Illa Font: Department of Electronics Engineering, Federal University of Technology—Parana, Ponta Grossa 84017-220, Brazil

Energies, 2022, vol. 15, issue 21, 1-21

Abstract: This paper presents the theoretical analysis, experimental results and generalized structure for N modules of an isolated dc–dc SEPIC converter. The structure comes from the integration of N conventional SEPIC converters based on the input-series and output-parallel connection. The main advantages provided by the proposed structure are reduced voltage stress across the semiconductors and division of the current stress in the output diodes. The proposed converter is presented in a generalized approach, varying the voltage stress across the semiconductors according to the number of modules used. As the converter uses more than one switch, the commands can be either equal or phase-shifted by 360 ∘ / N degrees. When operating with phase-shift modulation, a multilevel converter is obtained, which brings another advantage of the structure, since there is a reduction in the volume of the input inductors ( L i 1 and L i 2 ) and the output capacitor ( C o ). In this paper, the steady-state analysis, a dynamic model, system control and experimental results are presented for phase-shift modulation and discontinuous conduction mode (DCM). The performance of the proposed converter was verified in a prototype with four modules and the following specifications: 500 W output power, 800 V input voltage, 120 V output voltage and 50 kHz switching frequency. The converter achieved 94.42% efficiency at rated power.

Keywords: dc–dc SEPIC converter; multilevel; isolated-converter; DCM (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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